cables Mcqs
51. The insulation of the cable decreases with__________?
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A. the decrease in the length of the insulation

B. either A. or (b)

C. the increase in length of the insulation

D. none of the above

52. The insulating material for a cable should have__________?
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A. low cost

B. high dielectric strength

C. high mechanical strength

D. all of the above
53. High tension cables are generally used up to_____________?
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A. 132 kV

B. 11kV

C. 66 kV

D. 33kV

54. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
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A. double

B. none of the above

C. four times

D. one half
55. In capacitance grading of cables we use a _______ dielectric?
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A. homogeneous

B. hygroscopic

C. composite

D. porous

56. Dielectric strength of rubber is around____________?
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A. 5 kV/mm

B. 30 kV/mm

C. 15 kV/mm

D. 200 kV/mm

57. Capacitance grading of cable implies__________?
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A. use of dielectrics of different permeabilities

B. cables using single dielectric in different concentrations

C. capacitance required to be introduced at different lengths to counter the effect of inductance

D. none of the above

E. grading according to capacitance of cables per km length